NewsGator officials have also said that not only is Social Sites better integrated with SharePoint, but that it appeals to a different type of customer, because Yammer is multi-tenant, cloud-based software, while Social Sites is designed for on-premise and dedicated hosted environments, offering IT departments more control.

Microsoft announced its agreement to buy Yammer for US$1.2 billion in cash on June 25. Once the deal closes, the plan is to make Yammer part of Microsoft's Office Division.

The IDG News Service